Remove rainbow world map

And remove initial homeworlds on the homeworld map so the player can find them on their own. And also remove Slylandro homeworld location after hearing the probe speak coordinates, as the coordinates aren't supposed to be accurate.

Show the difficulty chooser by default, and mean it this time.

Separate out the Precursor Remix packages in the installer

SDL1: Fix DOS style planet intersect in HD

ANDROID: Fix thrust button & add Zoom In/Out to Shipyard and Outfit